<!DOCTYPE html>
<html>
<head>
<script src="../../../resources/js-test.js"></script>
<script src="../resources/common.js"></script>
</head>
<body>
<p id="description"></p>
<div id="console"></div>

<script>
description("Tests encrypt/decrypt for AES-GCM");

jsTestIsAsync = true;

// These tests come from the NIST GCM test vectors:
// http://csrc.nist.gov/groups/STM/cavp/documents/mac/gcmtestvectors.zip
//
// Both encryption and decryption are expected to work.
var kAesGcmSuccessVectors =
[
  // [Keylen = 128]
  // [IVlen = 96]
  // [PTlen = 0]
  // [AADlen = 0]
  // [Taglen = 128]
  {
    "key": "cf063a34d4a9a76c2c86787d3f96db71",
    "iv": "113b9785971864c83b01c787",
    "plainText": "",
    "cipherText": "",
    "additionalData": "",
    "authenticationTag": "72ac8493e3a5228b5d130a69d2510e42"
  },

  // [Keylen = 128]
  // [IVlen = 96]
  // [PTlen = 0]
  // [AADlen = 128]
  // [Taglen = 120]
  {
    "key": "6dfa1a07c14f978020ace450ad663d18",
    "iv": "34edfa462a14c6969a680ec1",
    "plainText": "",
    "cipherText": "",
    "additionalData": "2a35c7f5f8578e919a581c60500c04f6",
    "authenticationTag": "751f3098d59cf4ea1d2fb0853bde1c"
  },

  // [Keylen = 128]
  // [IVlen = 96]
  // [PTlen = 128]
  // [AADlen = 128]
  // [Taglen = 112]
  {
    "key": "ed6cd876ceba555706674445c229c12d",
    "iv": "92ecbf74b765bc486383ca2e",
    "plainText": "bfaaaea3880d72d4378561e2597a9b35",
    "cipherText": "bdd2ed6c66fa087dce617d7fd1ff6d93",
    "additionalData": "95bd10d77dbe0e87fb34217f1a2e5efe",
    "authenticationTag": "ba82e49c55a22ed02ca67da4ec6f"
  },

  // [Keylen = 256]
  // [IVlen = 1024]
  // [PTlen = 408]
  // [AADlen = 720]
  // [Taglen = 32]
  {
    "key": "e03548984a7ec8eaf0870637df0ac6bc17f7159315d0ae26a764fd224e483810",
    "iv": "f4feb26b846be4cd224dbc5133a5ae13814ebe19d3032acdd3a006463fdb71e83a9d5d96679f26cc1719dd6b4feb3bab5b4b7993d0c0681f36d105ad3002fb66b201538e2b7479838ab83402b0d816cd6e0fe5857e6f4adf92de8ee72b122ba1ac81795024943b7d0151bbf84ce87c8911f512c397d14112296da7ecdd0da52a",
    "cipherText": "fda718aa1ec163487e21afc34f5a3a34795a9ee71dd3e7ee9a18fdb24181dc982b29c6ec723294a130ca2234952bb0ef68c0f3",
    "additionalData": "aab26eb3e7acd09a034a9e2651636ab3868e51281590ecc948355e457da42b7ad1391c7be0d9e82895e506173a81857c3226829fbd6dfb3f9657a71a2934445d7c05fa9401cddd5109016ba32c3856afaadc48de80b8a01b57cb",
    "authenticationTag": "4795fbe0",
    "plainText": "69fd0c9da10b56ec6786333f8d76d4b74f8a434195f2f241f088b2520fb5fa29455df9893164fb1638abe6617915d9497a8fe2"
  }
];

function runAesGcmSuccessTestCase(testCase)
{
    var key = null;
    var keyData = hexStringToUint8Array(testCase.key);
    var iv = hexStringToUint8Array(testCase.iv);
    var additionalData = hexStringToUint8Array(testCase.additionalData);
    var tag = hexStringToUint8Array(testCase.authenticationTag);
    var usages = ['encrypt', 'decrypt'];
    var extractable = false;

    var tagLengthBits = tag.byteLength * 8;

    var algorithm = {name: 'aes-gcm', iv: iv, additionalData: additionalData, tagLength: tagLengthBits};

    // (1) Import the key
    return crypto.subtle.importKey('raw', keyData, algorithm, extractable, usages).then(function(result) {
        key = result;
        
        // shouldBe() can only resolve variables in global context.
        tmpKey = key;
        shouldEvaluateAs("tmpKey.type", "secret");
        shouldEvaluateAs("tmpKey.extractable", false);
        shouldEvaluateAs("tmpKey.algorithm.name", "AES-GCM");
        shouldEvaluateAs("tmpKey.usages.join(',')", "encrypt,decrypt");

        // (2) Encrypt.
        return crypto.subtle.encrypt(algorithm, key, hexStringToUint8Array(testCase.plainText));
    }).then(function(result) {
        bytesShouldMatchHexString("Encryption", testCase.cipherText + testCase.authenticationTag, result);

        // (3) Decrypt
        return crypto.subtle.decrypt(algorithm, key, hexStringToUint8Array(testCase.cipherText + testCase.authenticationTag));
    }).then(function(result) {
        bytesShouldMatchHexString("Decryption", testCase.plainText, result);
    });
}
  
var lastPromise = Promise.resolve(null);

kAesGcmSuccessVectors.forEach(function(test) {
    lastPromise = lastPromise.then(runAesGcmSuccessTestCase.bind(null, test));
});

lastPromise.then(finishJSTest, failAndFinishJSTest);

</script>

</body>
</html>
